To put it bluntly, Amtrak's current on-train WiFi sucks; even if you don't mind sharing 10Mbps with hundreds of passengers, there are significant gaps in coverage. Relief may be on the horizon, though. The mass transit company is soliciting bids for a trackside WiFi project that would deliver at least 25Mbps across whole routes. The improved access would both keep you connected for more of your trip and let Amtrak lift some of its restrictions on streaming media and other bandwidth-heavy tasks. If all goes according to plan, you might not have problems watching an online movie (or at least, listening to online radio) during a lengthy journey.